Cushioned valve.



E. V. ANDERSUK CUSHiONED VALVE.

APPLICATION FILED JULY I4, 1915.

E. 2395?%@ Patented Dec. 26, 1916.

INVENTOR WETNESSES ED'W'ARD V. ANDERSON, (7 13 282? ESS Applicatien filed. F111; 15 1313' To all who m may; concur:

Be it known that l, EDWARD V. ilminiiizsr N7 ].irovenients in Cushioned Valves, of which the following; is a specification.

lily invention relates more particularly to double-acting non'i'einrn valves. and its prii'narv object to provide a valve Which is completely balanced and cushioned in both positions and movements. and When closed by anbalancinn' such pressure, closed by the fnll power of the inlet presqure on a full area of the balancing device.

I have illustrated the inven v'ion in the form of a steam valve. in the ZHZCODJPEUlYlYlg drawing, which represents a vertical central. section of an angle valve to i on a boiler.

In this structure the lllltu (I) connnnnicafes through the perforated partition (5 and valve seal; 1'), with the outlet The valve seat is 'irovided with a series oi guide posts 0, within which is en'ibramd a closed cylindrical v: lve body J 1')1(3IFOl"l.l7lj/' made with an enlarged portion (a above the guide post 0. It has integral with it, a piston j and a cover plate 9 completel closing the alve body except for certain ports hereafter described. The cylindrical portion a may ilsell form the pinion in some case"; but I prefer l lie enlarged piston f in order to secure an additional cushioning function nndcrn ath it and in connection with the inwardly projecting ledge ii of the main valve casing C.

The main valve Easing has a cap or hood 2' with a, bracket j ear lllg the screw threaded valve stem Z; pas; [1Q through the hood. by v'av of a shilling box Z and preliarablv provided with a ground shoulder m making an additonal seal when the valve stein up in its normal position. lllhis stein carries at its bottom an inside piston n fitting the interior Walls of the valve body 0, and by means of port; 71 giving communication l etvveen the inside of the valve body with the chamber (ll) above the movable disk Thus the chamber (ll) and the interior of the valve bodv are both supplied with live or inlet pressure by way of the ball cheek valve 1 in the bottom of the "alve body. Either by leakage or by means of a small leakage port 7', the chamber (ll) communimates with the chamber (El) between the top bifon g manipnla inaticnily in 01 this p11 rpose. by full boiler area on top of ti'nc znre is and efleci'i v 7 by i 12, on zhe stein body being); entirely closed. vanta the eonsti'nl ion in our to those familiar l l aving' thus dc illnatrizted lowing:

1. 1'1 valve comp body, forming} in (UK anction v. 1 c: sing. a piston dashpo't cushioning a relatively st ionary p nion in sai body and d' iding it into two 0' saii'able ports 'tlir h the vbalance it under I pressure. imbalance and close ii: by etvhan 1 euro above said statioi'iary pioto A valve coni n'ising a casing with an apertnred diaphragm and valve SP: herein a ovlindor l rranged coi-aii-cnlzricallv villi valve seat, a ovlindrical cli'iscd hollovv v having an rnl t' said casing; slain ill with piwon l ternal piston whereby to close the valve valve portsto supply the dash-pot piston cham er and the inside of the valve body with pressure fluid from the inlet of the casing, andmeans to release the pressure between said internal piston and the egg. y pressure on the full area of the dash-pot piston.

3. In a valve a cushioning and closing means comprising a casing having a valve seat and a cylinder, a hollow valve body en.-

gaging said seat'and having a piston en Y gaging said cylinder and cooperating therewith to form a dash-pot, a fixed piston located inside the valve body and engaging the walls thereof, a check valve inlet to the valve body,- a port through the fixed inside piston communicating with the dash-pot, and a valve escape port arranged to exhaust pressure between the top of the valve body" and said interim-piston, substantially as described.

4. A' valve comprising a casing having a perforated partition with a valve seat and a cylindrical portion above the valve seat, a cylindrical hollow valve body working in and forming a dashpot with said casing cylinder, a supplemental and relatively stationary piston working in and forming a dash- 5. A' double-cushioned valve comprising i the combination with a casing having a valve.

seat and a cylindrical )ortion with its axis in the axis of thevalve seat, of a closed hol low cylindrical valvebo'dy engaging said seat and having a larger piston attached v thereto-andengaging the cylinder in the casing, a fixed shaft projecting througli an opening in the top ofsaid valve body and a supplerneritirhpiston on saidshaft engaging the inside of the valve body, and suitable ports to introduce live pressure through the valve body and said shaft to both sides of the enlarged piston of the valve body, whereby tocushion the valve on ,the lootlfmovements and allow closing the valve under full pressure of live steam when pressure is exhausted under the enlarged piston. In testimony whereof I have hereunto signed my name.

EDWARD V. ANDERSON. 

